Method for preparing high-purity tetraethylammonium hydroxide by continuous electrolysis

A tetraethylammonium hydroxide, high-purity technology, applied in the electrolysis process, electrolysis components, electrolysis organic production and other directions, can solve the problems of difficult large-scale safe production, low product yield, low product purity, etc. Current efficiency and product conversion, reduced energy consumption, improved safety and reliability

Active Publication Date: 2014-01-22
镇江润晶高纯化工科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for preparing high-purity tetraethylammonium hydroxide by continuous electrolysis, which overcomes the disadvantages of long reaction time, low product yield, low product purity, inconvenient operation and difficulty in large-scale safe production in the prior art

Method used

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  • Method for preparing high-purity tetraethylammonium hydroxide by continuous electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Aqueous tetraethylammonium bicarbonate solution with a concentration of 40% is put into the anode chamber 1 from the feed inlet 8 of the raw material. An aqueous tetraethylammonium hydroxide solution with a concentration of 2% was added to the cathode chamber 2 from the supplementary water inlet. Turn on the circulating pumps 11, 13, 15, 17. Connect the alternating current 7, connect the current between the anode plate 3 in the anode chamber 1 and the cathode plate 4 in the cathode chamber 2, so that the current density is 1000 A / m 2 , and the reaction temperature was 25 °C. In the anode compartment 1, tetraethylammonium carbonate is hydrolyzed to generate cations (CH 3 CH 2 ) 4 N ＋ and anion CO 3 2- , water will be hydrolyzed to generate H ＋ and OH － . Cation (CH 3 CH 2 ) 4 N ＋ 、H ＋ with the metal cation R in solution n＋ Through the cation exchange membrane 5 into the cathode chamber 2. while the anion CO 3 2- with OH － Arriving at the anode plate 3...

Embodiment 2

[0029] Change the concentration of tetraethylammonium bicarbonate to 30% tetraethylammonium chloride, change the concentration of tetraethylammonium hydroxide initially added to cathode chamber 2 to 3%, and change the current density to 1500 A / m 2 , the reaction temperature was changed to 35°C, and the rest of the steps were the same as in Example 1. After the electrolytic reaction, when the concentration of tetraethylammonium hydroxide in the cathode chamber 2 was greater than 25%, the product was output from the outlet 9 at the bottom of the cathode chamber 2. The concentration of each metal ion in the product is less than 20 ppb, and the carbonate radical is less than 100 ppm, as shown in Table 1; the product conversion rate of this method is 98.3%.

Embodiment 3

[0031] Change the concentration of tetraethylammonium bicarbonate to 50% tetraethylammonium bromide, change the concentration of tetraethylammonium hydroxide initially added to the cathode chamber 2 to 4%, and change the current density to 1700 A / m 2 , the reaction temperature was changed to 45°C, and the rest of the steps were the same as in Example 1. After the electrolytic reaction, when the concentration of tetraethylammonium hydroxide in the cathode chamber 2 was greater than 25%, the product was output from the outlet 9 at the bottom of the cathode chamber 2. The concentration of each metal ion in the product is less than 20 ppb, and the carbonate radical is less than 100 ppm, as shown in Table 1; the product conversion rate of this method is 98.2%.

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Abstract

The invention discloses a method for preparing high-purity tetraethylammonium hydroxide by continuous electrolysis. The method comprises the following steps: placing tetraethylammonium salt aqueous liquor with the raw material concentration of 30-50% in an anode chamber of a two-chamber one-membrane ionic membrane electrolysis device, adding tetraethylammonium hydroxide with the concentration of 2-5% into a cathode chamber of the device, and communicating current between an anode plate and a cathode plate, wherein in the anode chamber, tetraethylammonium salt is hydrolyzed to generate cation (CH3CH2)4N<+> and anion X<->, the cations (CH3CH2)4N<+> and H<+> and a metal cation Rn<+> in the liquor enter the cathode chamber through a cation exchange membrane, and the anions X<-> and OH<-> reach the anode plate to generate a gas; in the cathode chamber, tetraethylammonium hydroxide is produced from the cation (CH3CH2)4N<+> and OH<-> obtained by water hydrolysis, H<+> reaches the cathode plate to obtain electrons to generate H2, and tetraethylammonium hydroxide with the concentration of 5-30% is obtained. According to the method disclosed by the invention, feed and discharge are continuously carried out, and the concentrations of the materials in the anode and cathode chambers are relatively constant, so that the current efficiency and the product conversion ratio are improved, and the energy consumption is lowered.

Description

Technical field [0001] The present invention involves a method of preparation of ammonium oxide of ethyl -based, specifically refers to the use of tetrabon ammonium salt as the raw material.method. Background technique [0002] Tetrachide (Teah) is an organic alkali that can be used as a phase metastatic catalyst, a templates made of molecular sieve, a cleaning agent, and an oil industry dehydration agent.Separate tetrachinonium chloride; then washed and exchanged ion exchange with high -efficiency alkaline resin to obtain tetraonethyl hydrotide ammonium oxide rough products. Finally, it was concentrated by decompression to obtain the finished product of ammonium oxide.This preparation method is two reactions of gas and liquid, long time, and low product revenue. [0003] In the patent document of the Chinese patent public account of CN1347872A, a method of using tetrachloride as a raw material and the exchange with strong alkaline anion resin to prepare tetramidized ammonium oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/00C07C211/63
Inventor 赵文洲
Owner 镇江润晶高纯化工科技股份有限公司
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